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Lantus Part D coverage 2027

Lantus is a brand of insulin glargine. What agents check before quoting it: how many 2027 Part D plans cover it, on which tier, with what restrictions and copays, by plan type, carrier and state.

Coverage at a glance

In 2027, 5,295 of 5,492 Medicare Part D and Medicare Advantage drug plans (96.4%) list Lantus on their formulary, across 275 of 286 formularies. The most common placement is tier 3 (4,699 plans, 88.7% of those covering it). 0 of the covering plans require prior authorization (0%), 1 step therapy and 833 a quantity limit.

What a 30-day fill costs

610 covering plans charge a flat copay for a 30-day supply at a preferred retail pharmacy after the deductible — median $30, 221 of them $0; 4,685 charge coinsurance instead — median 21% of the drug's cost. Covered insulin is capped at $35 for a month's supply.

What changed since 2026

2026: 5,337 of 5,496 plans covered it (97.1%); 2027: 5,295 of 5,492 (96.4%).

Of 4,367 plans offered in both years, 8 added it to the formulary and 37 dropped it.

Among plans covering it both years, 44 moved it to a higher tier and 273 to a lower one; 0 added prior authorization and 0 removed it.

Tier placement

By plan type

By carrier

By state

Medicare usage

Medicare Part D paid for 12,200,072 30-day fills of Lantus in 2024 for about 1,686,606 enrollees, at an average total cost of $67.28 per 30-day fill (CMS Part D Prescribers by Geography and Drug, national).

Related

• Basaglar
• Toujeo
• Semglee

Counts are over every Medicare Advantage drug plan and stand-alone Part D plan in the CMS monthly formulary files, excluding employer plans. A plan counts as covering a drug when any strength or form of it is on the plan’s formulary; the tier, prior authorization, step therapy and quantity limit shown are the most favorable version on that formulary. Copays are for a 30-day supply at a preferred retail pharmacy after the deductible. This is a reference for licensed agents, not a plan recommendation; verify with the plan’s formulary before advising a client. Source: CMS Part D formulary files (release 10/08/2026). CMS formulary data.